Writing instrument



FIG. 1 is a front elevational view of a writing instrument showing mynew design;

FIG. 2 is a rear elevational view;

FIG. 3 is a side elevational view, the opposite side being a mirrorimage thereof;

FIG. 4 is a top plan view; and,

FIG. 5 is a bottom plan view thereof.

The ornamental design for a writing instrument, as shown and described.